Coil winding machine



June 30, 1931. H. w. LILLIBRIDGE COIL WINDING MACHINE 2 Sheets-Sheet 1 Filed June 28, 1929 June so, 1931, L B D 1,812,349

COIL WINDING MACHINE Filed Jun e 2a, 1929 2 Sheets-Sheet 2 Patented June 30, 1931 UNITED STATES.

PATENT OFFICE HOXSIE W. LILLIBRIDGE, F PHILADELPHIA, PENNSYLVANIA, ASBIGNOB '10 ATWATEB KENT MANUFACTURING COMPANY, OF PORA'I'ION OI PENNSYLVANIA.

PHILADELPHIA, PENNSYLVANIA, A COB- GOIL W'INIDING MACHINE Application filed June 28,

. In accordance with my invention, as a coil is being wound in one direction upon a. coil form, structure guiding the conductor tothe form is intermittently moved in a reverse direction to wind at least one turn upon previously wound oonvolutions; more particularly, the guiding structure is supported by a carriage moved constantly. in one direction, as by a screw, axially of. the coil form, which is rotating, and is independently moved in opposite directions by cam structure operating in timed relation to the coil form; preferably, for a two layer coil the cam rotates atsomewhat less than half the speed of the coil form and the abrupt changes as in the cam face are unequally spaced to effect staggering of the cross-overs of the banked winding.

Further in accordance with my invention, when the supporting structure is in posi- '23 tion to begin winding of the coil, the cam mechanism is disabled to permit several turns of .wire to be wound directly upon the coil form without banking.

Still further in accordance with my inven- 33) tion, between an indicator and the rotating coil form there is interposed suitable speed reduction mechanism to permit an operator readily and exactly to determine when the coil is completed.

My invention further resides in the features of construction and arrangement hereinafter described and claimed.

For an illustration of one of the forms the apparatus may take, reference is to be had to the accompanying drawings, in which:

Fig. 1 is a plan .view with parts broken away of a coil winding machine embodying my invention.

Fig. 2 is an end elevational view of Fig. 1.

Fig. 3 is an elevational view with parts removed of Fig. 1.

Figs. 4 and 5 are detail views of mechanism shown in Fig. 1.

Fig. 6 is a detail view on enlarged scale,

1929. Serial 110. 374,327.

of a coil form and a wire guiding roller of the winding apparatus.

Fig. 7 is a view, on reduced scale, taken on the line 7-7 of Fig. 1.

Referrin to the drawin s, the drive spindle 1 to which the clutch disc 3 is secured as I by pin 2, extends through and is journaled in the main supportin member 4 of the winding machine. The pulley 5, driven from any suitable source of power, is provided with a clutch facing 6 o cork, or the like, forced into engagement with the clutch disc 3 by one arm of a bell crank lever 7 mounted upon a shaft 8 journaled in an extension 9 of the main supporting member or main casting 4 of the machine, the other arm 10 of the bell crank lever bein adapted to engage the periphery of the c utch wheel 3 to serve as a brake when the arm 7 is moved away from the hub portion 11 of pulley 5. The position of the bell crank lever 10 is determined by an operator of the machine, usually by move ment of a footpedal suitably connected to the lever.

To the other end of the drive shaft 1 is detachably and adjustably secured a coil mandrel or chuck 12, of dimensions suited for the coil forms placed thereon. The lead screw 13 extending parallel to drive shaft 1 is driven thereby throu 'h gears 37, 14, 15, 16, 17 and 18. The pairs 0? gears 14, 15 and 16, 17 mounted res ctively upon stud shafts 14a, 16a and held in position thereon by the screws 19a which pass through washers 19 threadably to engage the ends of the shafts are secured to each other for movement in unison or are into ral. They are replaceable by other sets 0 gears having a different ratio of pitch diameters of gears 15 and 16,as when different sizes of wire are employed for the coils to be wound, to obtain desired rectilinear movement'of a wire guiding carriage 20 having a threaded portion 21 detachably engaging the leadscrew 13. The same result may be obtained by replacing screw 13 by one of a different pitch. The carriage member 20 slidably mounted upon a rod 22 extending from the main member 4 of the apparatus is biased for counter-clockwise rotation, Fig. 2, into engagement with lead screw 13, as by a spi'ing 23 whose ends are connected respectively to a bolt-24 threaded into carriage .20 and-to an eyelet 25 secured to a bolt or the like 26 extending from the base 27 of the machine. When, desired, as hereinafter set forth, the carriage 20 may be moved away from lead screw 21 by handle 20a until strap 48 engages, the bottom of the groove in cam 34,in which" position the threade'd portion 21 of the carriage 20 is out of engagement with lead screw 13.

At the upper end the carriage20 is provided with a bearing 28 in which the rod 29 may reciprocate to limited extent in a path parallel to the axis of rotation of the mandrel 12. The expansion spring 30 between carriage 20 and a guide plate:31 slidably engaging at its lower end the pin 32 extending from carriage 20, biases the cam'follower 33 20 at the other end of shaft or bar 29 toward or -i nto engagement with a cam 34 slidably mounted upon and keyed to shaft35. A strap 48 embracing or encircling a portion of reduced diameter of cam 34 is connected to 25 the upper part of the carriage 20 and with it causes the cam 34 to move along shaft 35. The cam shaft 35 is driven from the main drive shaft 1 by gears 36, 37 rotating for a two layer coil at somewhat less than half the 3o speed of the drive shaft in a counter-clock- 1wise direction as viewed in Fig. 3; for a three to this engagement, the guide plate 31 mountlayert coil the gear ratio would be such that l the cam shaft rotates'at somewhatless than one-third the speed of the drive shaft, etc. .To

35 the end of the reciprocating rod 29 is secured a wire guiding finger 38 having a guiding eyelet 39' to receive the wire or conductor 40, for example, Litzendraht. The extension 41 of the guiding finger terminates in a grooved member 42 through which the wire passes immediately prior to its engagement with a coil form 43. The beveled face 44 of a roller' 45 rotatably mounted upon a stud shaft 46 at the end of a plate 47 secured to and extending in the same direction as extension 41, engages and retains in place the turns of wire wound upon the form 43, and controls axial movement of the wire being wound.

In the operation of the device, an operator slips a coil form 43 over the mandrel 12, until the end of the form abuts against a shoulder 49 of the mandrel. The end of the wire 40 extending through eyelet 39 and groove 42 is temporarily caught under a spring clip 50 attached to the coil mandrel or chuck 12. After the handle 20a is pushed backwardl to move carriage 20 out of engagement wit lead screw 13, the carriage is slid along the guiding bar 22 until it engages the stop 51, which is so adjusted that immediately prior 7 ed upon the bar 29 strikes a shoulder 52 of a portior. of the main casting 4 in which the drive shaft 1 and cam spindle 35 are journaled, compressing the spring 30 and moving the cam follower 33 out of engagement with cam 34. To start the actual winding operation, the operator then moves a treadle, not shown, simultaneously to effect disengagement of the brake withthe periphery of the clutch disc 3 and contact between the facing 6 of pulley 5 and a co-operating face of clutch member 3. After for example the main drive spindle has'revolved twice in case of twolayer bank to wind two turns of wire directly upon 'thecoil form, the lead screw 13has suficiently advanced the carriage 20 to bring the face of cam 34 into engagement withcam follower 33. As the cam continues to rotate the follower 33 drops into the depression 53 of the cam moving-the wire guiding finger 38 backward, lifting the conductor" 40 to wind the third turn of wire upon the previously wound turns #1 and #2, (Fig. 6). Substantiall at the completion of the turn, the cam fol ower 33 engages the abrupt, short rise 54 of cam 34 causing axial advance of forward movement of the wire guiding finger 38 and dropping of conductor 40 to wind the;fourth turn of wire directly upon the coil form 43. vAfter somewhat .more than a complete revolution of the coil form 43, the cam follower 33 abruptly drops from the highest point of the caminto the depression 53 and the cycle of operation is completed, the mechanism automatically bank-winding the wire upon the coil form, and staggering the cross-overs of the wire, the beveled face 44 of-the roller retaining the last wound convolutions in proper posi tion and reventing collapse of the winding.

Referring to Fig. 8, the upper graph W illustrates the axialmovement of the wire produced jointly by the lead screw 13 and cam 34, and the'lower graph G illustrates motion of the wire-guiding finger effected by cam 34. Starting at S, the conductor is wound upon the coil form reaching the point a: corresponding to the depression 53 of'cam 34 after completion of a revolution and a fraction of the coil form; from a: to y, the wire is bent back sharply over the top of the last wound turn and from y to z a turn of the conductor is wound over the last two turns. At 2, the cam follower 33 engages rise 54 bending and dropping the wire again onto the coil form, the cycle repeating from the I point S.

To avoid bunching, the lifts and drops turns wound upon the coil, I prefer to use the'following arrangement which greatly.

facilitates high speed production of the coils with an increase in accuracy. Between a shaft 55 to which an indicating finger 56 is secured and the leadscrew 13 there isinterposed a-reduc-tion gearing comprising the gears 56,

. 57- and 58, the first of which is secured to a shaft 59 to the other end of which is secured a miter gear 60 engaging a miter gear 61 on shaft 55. A suitable ratio between the speeds of indicator shaft and mandrel 12 is 1 to 16., The chief purpose of the pair of miter gears and 61 is to enable the operator at the front of the machine clearly to see the relation between the pointer 56 and theplate 57. .A bracket member attached at its forward end as by bolts 66 to base member 27 carries the indicator plate 57 The gears 57 and 58 suitably attachedto each other or integrahare rotatably mounted upon the stud shaft 62 extending through the main casting 4 of themachine' and held in position thereon as by screw 63 passing through disc 64 and threadably engaging the end of the shaft. As, the coil is being wound the operator need pay no attention to the indicator until it is obvious that the ,end of the coil is being approached. The machine is stopped by operation of bell crank lever 7 through foot treadle not shown and the exact number of turns desired have been wound upon the form 43 when the pointer 56 is opposite the step ping mark 67.

Preferably there is provided a spring 69 which biases the brake arm 10 to active position, which permits the operator to use both hands in handling the coil at the beginning of and at -the completion of the winding operations The distance between the starting point 68 and stopping point 67 on the plate 57 permits the operator to rotate the coil form by utilizing the clutch member 23 as a hand wheel during the application of sealing wax or the like to spaced points at the ends of the coils. The banlowound Litzendraht coils as described are particularly adapted to beutilized in radio receiving apparatus in assoc-a? tion with tuning condensers to comprise therewith selective tuning circuits as claimed in copending Schade application Serial No. 250,229, filed January 28, 1928. The mecha? nism can of course be utilized to wind coils for other purposes. 8

-conductor-guiding member,

What I claim is: Y

1. Mechanism for producing bank-wound coils comprising a rotating coil support, a conductor-guiding member, supporting structure therefor movable in one direction during a coil-winding operation, and means effecting intermittent movement of said member in an opposite direction during said win-ding operation.

2. Mechanism for producing bank-wound coils comprisingfa rotating coil support, a supporting structure therefor continuously movable in one direction .duriiig a coil-winding operation, and meansiperiodically effecting movements'of said member alternately in opposite directions as said supporting structure moved in said one direction.

3. Mechanism for producing bank-wound coils comprising a rotating coil support, a

conductor-guiding member movable in a thereof, and mechanism operating in timed relation to said coil support effecting reciprocation of'said member with respect to said structure to wind conductor over previously wound turns thereof and in the same direction.

5. Mechanism for producing bank-wound coils comprising a rotating support for u. coil form, structure movable in one direction parallel thereto, conductor-guiding mechanism mounted thereon for movement independentlythereof, mechanism operating in timed relation to said support and effecting movement of said member with respect to said structure as it moves in said one direction, and means disabling said mechanism when said structure is in a region adjacent a. limit of its movement to effect winding of several turns of conductor directly on the coil form. y

6. Mechanism for producing bank-wound coils comprising a rotating coil support, a conductor-guiding member movable in a path parallel to the axis thereof, and operating means therefor comprising a member continuously movable in one direction parallel to said support, a cam operating in timed relation to said coil support periodically to effect movements of said guiding member in opposite directions longitudinally of said coil supportas said second membr moves in said one direction, and an element earned by 3 said member to hold in position the conductor aswound.

7 Mechanism for producing back-wound coils comprising a rotating coil support, a conductor-guiding member .movable in a path parallel to the axis thereof, operating means therefor comprising a member movable in one direction parallel to said support,

' land a roller having a beveled face adapted to cbntact with the conductor as wound.

;8. Mechanism for producing bank-wound vcoils comprising a rotatingcoil sup ort, a screw, a carriage moved thereby, a s aft, a cam rotatable therewith andmovable linearly thereof by said carriage, a wire-guidingmember mounted upon said carriage and periodically actuated by said cam to effect reciprocation thereof with respect tosaid carriage, and means for effecting rotation of said support, said screw, and said cam in timed relation. e I

9. Mechanism for producing bank wound coils comprisinga rotating coil support, a

. screw, a carriage member moved thereb cond t e ductor guiding structure mounte timed relation to rotation of said coil support to effect reciprocation of said .fin er.

11. Mechanism for producing ank-wound coils comprising a rotating coil support, a conductor-guiding member, supporting structure therefor movable in one direction during a coil winding operation, and means 13. Mechanism for producing bank wound coils comprising a support for a coil form, a conductor-guidlng member, supporting structure therefor continuously move 10 longitudinall of said coil in one direction to wind con uctor spirally on said form, and means intermittently to move said guiding member in opposite directions as sai structure moves in said one direction to wind consecutive turns of said spiral in difierent layers and in the same direction.

;14.- Mechanism for producing bank Wound coils comprising a rotatable support for a coil form, a member for guiding conductor on said form, supporting structure therefor continuousl movable longitudinally of said coil in one ection, and means moving said member alternately in opposite directions longitudinally of said coil form as said structure moves in saidone direction, each of said movements occurring once for each two revolutions of said coil support to wind every second turn of conductor over previously wound conductor.

15. Mechanism for-producing bank-wound coils comprising a rotatable support for a coil form, a support continuously movable in one direction parallel to the axis of said rotatable support, a conductor-guiding member carried by said member and mounted for movement inde endentl thereof parallel to the peri hery 0 said coi form, a shaft driven v in time relation to said rotatable support,

and a cam slidably mounted on said shaft 7 and movable with said carriage for periodi-' cally moving said member in opposite directions as said support moves in said one direction.

I HOXSIE w. LILLIBRIDGE.

for effecting movements of said member al ternately in opposite directions-and at unequal intervals as said structure moves in said one direction.

12. Mechanism for producing bank-wound coils comprising a rotating coil mandrel, a shaft rotating at suitably less than half the speed of said mandrel,'a cam thereon, a car riage continuously movable in a path parallel to said mandrel during a coil-winding operation, and a wire-guiding finger mounted upon and movable with said carriage and actuated by said cam to impart to said conductor components of movement which are alternately cumulative and differential to the movement imparted by said carriage. 

